Claim CE001:

The radioactive decay of several elements produces helium, which migrates
to the atmosphere. There is too little helium in the atmosphere to
account for the amount that would have been produced in 4.5 billion years.
Escape of helium into space is not sufficient to account for the lack.

Source:

Response:

Helium is a very light atom, and some of the helium in the upper
atmosphere can reach escape velocity simply via its temperature.
Thermal escape of helium alone is not enough to account for its
scarcity in the atmosphere, but helium in the atmosphere also gets
ionized and follows the earth's magnetic field lines. When ion outflow
is considered, the escape of helium from the atmosphere balances its
production from radioactive elements (Lie-Svendsen and Rees 1996).